Which of the following function is surjective but not injective
Which of the following function is surjective but not injective
- A
$f : R \to R$ $f (x) = x^4 + 2x^3 - x^2 + 1$
- B
$f : R \to R$ $f (x) = x^3 + x + 1$
- C
$f : R \to R^+ f (x) =$ $\sqrt {1 + {x^2}} \,$
- D
$f : R \to R f (x) = x^3 + 2x^2 - x + 1$
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